Tonnage recorder for ships



S. P. BAHNSEN.

'TONNAGE RECORDER FOR SHIPS.

APPLICATION HLEDMAR. s, 1919.

Pateted Mar. 21, 1922.

6 SHEETS SHEET S. P. BAHNSEN. TONNAGE RECORDER FOR SHIPS.

APPLICATION HLED MAR.8

Patented Mar. 21, 1922.

6 SHEETSSHEET 2.

S. P. BAHNSEN.

TONNAGE RECORDER FOR SHIPS.

APPLICATION FILED MAR; 21, 1919.

1 ,409,9 1 4, Patented Mar. 21, 1922.

6 SHEETSSHEET 3- ATTY.

s. P. BAHNSEN;

TONNAGE RECORDER FDR SHIPS.

APPLlCATlON FILED MAR.8,19I9.

Patented Mar. 21, 1922.

6 $HEETS-SHEET 4.

Fig. 5.-

S. P. BAHNSEN.

TONNAGE REGORDERFOR SHIPS.

'APPLlCATlON-HLED MAR 8, 1919.

Patented Mar. 21, 1922.

6 SHEETSSHEET 5- MEEWE:

S. P. BAHNSEN.

TONNAGE RECORDER FOR SHIPS.

APPLICATION FILED MAR. 22, 1919- 1 ,409,914, Patented Mar. 21, 1922.

6 SHEETS-SHEET 6.

ATT'y.

UNITED STATES PATENT OFFICE.

SOPHUS PETER BAHNSEN. 8F VEST HARTLEPOOL, ENGLAND.

TONNAGE RECORDER FOR SHIPS.

Application filed March 8, 1919.

To all whom it may concern:

Be it known thatl, .Sornos Pn'rnn BAH}?- SEN, of 30 South Road, ll estHartlepool, in the county of Durham, England, have invented certain newand useful Improvements in Tonnage Recorders for Ships of which thefollowing is a specification.

This invention relates to instruments for measuring and recording thetonnage taken on board and discharged'from ships. he object of thisinvention is to provide an efficient instrument for this purpose.

An instrument made in accordance with this invention comprises a stand,a shaft disposed longitudinally of the vessel mount ed on pivotal jointson hearings on the stand, a frame suspended from the shait. a drum onsaid frame disposed parallel to the shaft adapted to be rotated by thevertical movement of a float, apeneil or the like adapted to be movedlongitudinally of tie drum by the vertical movement of the float, so asto scribe a mark on a chart mounted. on said drum.

Referring to the drawings filed herewith:

F ig. 1 is a general front elevation of one form of instrument made inaccordance with this invention.

Fig. 2 is an end view.

Fig. 3 is a diagrammatic front elevation of the instrument.

Fig. 4 is an end elevation.

Fig. 5 is a back elevation.

Fig. 5 is a plan View of the supporting plate of the instrument.

Fig. 6 is an end view opposite to that: shown in Fig. l.

Fig. 7 is a section shewing the float and pipe.

Fig. 8 is a diagram of the chart on which the record is made.

Fig. 9 is a detail of the scale mounted on the drum 9.

Fig. 10 is a central longitudinal sectional view, on an enlarged scale,of tle coned sleeve and its operating mechanism, for increasing thespeed of the scale drum.

Fig. 11 is a cross-sectional view of the float and its enclosing casing.

The apparatus shewn in the drawings comprises a standard A (see Figs. 1and f2) carrying an arm B on which is mounted a plate C from which hangiron plates l) carrying centres E the centres F.

tween Specification of Letters Patent.

lf'atcnted Mar. 21, 1922. Serial No. 281,444. I

E is mounted a shaft F referred to hereafter as the suspension shaftfrom which the frame G of the instrument is suspended by the hangers ll.Means is provided for vertically adjusting the shaft F with relation tothe recording device hereinafter described, which adjusting means is shin Figs. 3 and 6 and comprises a nut 88 vertically slidable in a slot inone of the end plates D and carrying one of the centers or trunnions Efor the shaft F. The vertical position of the nut 38 is controlled bv ascrew 39 threaded. through said nut and swiveled at its lower end in,the plate D, said screw being provided at its upper end with a handwheel 37. The moving parts of the instrument on the frame G comprise adrum a hereinafter referred to as the float drum, mounted on a spindleZ) a float c suspended from the drum by a cord (Z which may be termedthe load line cord adapted to take one or two turns on to the drum a andto be kept-taut by a counter balance weight or other suitable means asthe vessel fiills in the water. A pointer 6 attached to the spindle b ofthe float drum travels over a dial 7 hereinafter referred to as the deadeight scale dial to indicate the load and the maximum load allowableaccording to Lloyds Register or any other British or Foreign Registerdependingon the density of tie water. and on the summer, Indian summeror Winter North Atlantic. marks as indicated on the chart (see 20, Fig.8). hiieans for traversing the drum axially as it rotates are provided,so that the float may remain vertically under the same spot with respectto the instrument. This means coinprises a sleeve 21 on which the drum 0is secured, the sleeve being slidable at one end thereof on the shaft 7)and threaded at its opposite end on a stud Z) secured in the frame (i(see Fig. 4;). the pitch of the thread corresponding with the pitch ofthe helical groove formed on the drum for receiving the winding of thecord or cable (Z. So that as t 1e drum is rotated by thewinding orunwinding of the cable the threaded engagement of the fixed stud bandsleeve 21 will cause axial movement of the drum a, whereby the cable isalways in direct vertical position above the float. A drum 9 hereinafterreferred to as the scale drum. receives a scale or chart 5 (Fig. 8)adapted to be wrapped on said scale driun, and means for rotating thescale drum by tlie'rotation of the float drum are provided. Said meansmay comprise a drum h mounted on a spindle j, hereinafter referred to asthe take up drum, a worm is on said spindle adapted to gear with a wormwheel on on the scale drum, the cord (Z on the float drum a beingadapted to be wound on to the take up drum /L as the ship is beingloaded and vice versa as the ship is being unloaded, by the action of acounterweight or otherwise, the weight of the float causing the takeupdrum to pay out the cord as the vessel rises, and means for traversingthe said take up drum axially so that the cord may pass from one drum tothe other evenly as the float drum (1 is traversed. The traversing meanssimilar to that of the drum a, that is to say the drum h is secured to asleeve 22 which is slidable at its inner end on the shaft j. while itsopposite end is threaded on a stud j, so that as the drum it movesaxially the drum It will move in unison therewith. A carrier or thelikeg is adapted to be trav ersed longitudinally of said scale drum andcarries a pointer 0 (Fig. 4) to indicate the tonnage of the ship on thefixed scale 18 hereinafter referred to; and a pencil or the like 0adjustable on the carrier is adapted to be traversed longitudinally ofsaid scale drum and to place a record on the chart Means for traversingsaid pencil 0 and pointer 0 comprise a cord 79 attached to the carrier gon which the pencil 0 is disposed, passed over a pulley a mounted on theframe of the fixed scale 18 and thence to a pulley r on the axle of thescale drum 9, to the rim of which latter pulley the cord is secured, themotion of the pencil 0 being restrained by a counter balance weight .9connected by a cord t to the carrier Q and pulling in a directionopposite from the cord 7) attached to the pulley r and the. weight 8tending to turn the drum. (1 in a contrary direction to the float r sothat the rope (Z is always kept taut. dial w hereinafter referred to asthe displacement scale dial indicates the displacement fore and, aft bymeans of a pointer to mounted on a roclc ing spindle or sleeve asreferred to hereafter as the driven rocking spindle disposedtransversely of the ship said pointer being adapted to pass over saiddisplacement scale dial 4). The driven rocking spindle carries a toothedpinion 3, means being provided for rocking said spindle comprising aweight l (Fig.5) mounted on a second rocl ingspindle or sleeve 5,referred to hereinaft-er as the driving rocking spindle, and a series oflevers and connecting links, 6, 7. 8, t), 10, and 11 adapted to move atoothed wheel 12 or the like gearing with the pinion on the said drivenrocking spindle. The levers 8 and 10 are pivoted at and 10 respectivelyto the fran'ie. The dial n is rotatable and weighted by the 1 )enduluinweight 2 so as to maintain a fixed position in space despite theoscillations of the ship.

In order to correctly indicate the tonnage taken on or discharged fromthe ship, it is necessary to take into account the capacity of the shipfor each inch of depth below load line, and for this purpose means areprovided for varying the ratio of motion between the float and the scaledrum. This may be effected by increasing the speed of the scale drum asthe ship is loaded so that for each successive inch for instance, thatthe float suspension cord (Z is wound up on the float drum a the speedof the scale drum 5/ is increased. The means for effecting thisincreased speed may comprise a coned sleeve 1.3 of suitable form (Fig.(3), hereinafter referred to as the compensator adapted to be rotated bythe cord as it passes from the float drum (4 to the take up drum 71, therotation of the sleeve 13 causing it to travel axially so that motion islost or gained by the variation in the length of the cord forming oneturn round the said sleeve producing the desired ratio of motion toeifect the correction.

The float drum 0, take up drum h, scale drum 9, driven rocking spindlem, driving rocking spindle 5, lever 6, 7, 8, 9, 10, 1], connecting rodsand toothed wheel 12 are all mounted on a frame suspended from thesuspension shaft F disposed longitudinall of the vessel, said shaft, ashereiiibefore de- 100 scribed, being vertically movable to adjust theposition of the instrument with respect to the load lines on the vessel,a dial 16 and indicator 1'? being provided to show the adjustment (Fig.indicating the tonnage in the ship, hereinafter referred to the tonnagescale. is provided longitudinally of the scale drum 5 the pointer 0 onthe carrier 1 imlicating on the tonnage scale 18 the tonnage taken in110 the ship, this same indication being recorded by the pencil 0 on thechart 0. The chart on the scale drum y is provided with a diagonziilband 19 over which the pencil 0 travels as the scale drum is rotated,and the 115 pencil moved longitudinally of the scale drum. The scale isaccurately placed on the cale drum 9 to a load line mark, and ispreferably locked in a glass case. In order that the pencil may trace anew line when 120 the ship is being unloaded, the glass case may beopened and the pencil moved with respect to the carrier longitudinallyof the drum so that the trace made by the pencil will still indicate thecorrect tonnage on a 125 fresh trace. The pencil can be movedlongitudinally at each port to indicate the load taken in at each port.The scale can be removed from. the scale drum by the captain and sent tothe owner who will be :ble to 130 The fixed scale 18 for read the amountof tonnage taken or discharged at each port. The scale 18 and scale onthe chart g are. designed for every ship from the dead weight scale andlength and breadth of the ship.

As bestshown in Fig. 10, the coned sleeve 13 is mounted loosely on aflxed spind e 23 which carries a toothed pinion 9%. On the coned sleeve13 is an arm 25 provided with a nut adapted to engage a threaded spindle27 on which is mounted a gear wheel 28 adapted to engage the fixedpinion 24 on the spindle 23.

In operation, the cord (Z passing round the coned sleeve 13 causes thesleeve and the arm 25 to be rotated as the drums at and it rotate thegear 28, which constitutes an epi cyclic train with the fixed pinion 24,rotating also, with its spindle 27, causing the nut to travel along thespindle 27 and there by causing the cord (Z to take a diflerent positionon the coned spindle and so compensate for the difierence in capacity ortonnage for varying depth of the ship, the cord (Z being always clear ofthe spindle 27. By this means, while the counter 42, operated by thesleeve 13 of the compensator, gains on the float drum as the cabletravels towards the pointed end of said sleeve as the ship sinks deeperon being loaded, and thus indicates the tonnage, the take-up drum, scaledrum, point-er 0 and pencil 0 are displaced.

proportionately to the draught of the ship, the tonnage being read fromthe record by means of a scale on the chart.

In order to ascertain the list of: the ship, I provide a pendulum 29mounted on the shaft F. The pendulum carries a toothed rack'30 (Fig. 4)adapted to gear with a pinion 31 on a shaft 32, on which is mounted apointer 33 which moves over a dial 34 fixed to the standard of theinstrument and is graduated to show the list in inches or feet per widthof beam.

The float c is disposed in a pipe (Fig. 7) which is suspended inside theship from a suitable universal joint at a point opposite the load linemark. The tube extends downwards just below the light ship line and isconnected by a small flexible tube not shown, but which may be attachedto the nipple 35 to the outside water.

A counting mechanism 36 (Figs. 3 and is adapted to be operated bysuitable gearing, which has been omitted for the sake of clearness, fromthe shaft 6 to indicate in "feetthe draft, the inches being shown on thedial The counter 12 (Fig. 6) is adapted to be operated by the sleeve 13of the compensator, to show the tonnage as the ship is loaded as aboveexplained. This tonnage is also given by the pointer o and by the recordon the scale drum. The float e is provided with guide rollers 43. Thepipe is provided with guide rollers 44 which bear against a fixed guide45 suitably mounted on the frame of the instrument.

The invention is particularly valuable to ship owners and also to thosenavigating the vessel inasmuch as the extent to which the vessel hasbeen loaded or discharged at the various ports can be seen at a glance.

The instrument indicates the full capacity in fresh or cold waterwithout fear of any mistakes. Ship owners can, on receipt ot recordingchart, see what the vessel has actually done on her voyage, therecording chart being so fixed on the drum that false recording isimpossible.

The dead weight scale dial is marked to show the density of the water sothat when a ship is fully loaded in salt water, the pointer 0 moves toone side of the dial as the ship moves into fresh water, the hand movesclockwise until it arrives to a point marked fresh water. Converselywhen loading a ship in salt water, the captain can see from the dial towhat extent the ship can be loaded.

lVhat I claim and desire to secure by Letters Patent is 1. An instrumentfor measuring and recording the tonnage on ships, comprising a rotatablescale drum, a reciprocable carrier adapted to traverse said scale drum,a float drum, a float secured to said float drum by means or" a cordthereby to rotate the drum in one direction, means for transmitting therotary motion of said float drum to said scale drum and to said carrier,and means for retracting the carrier thereby to cause rotation of thescale drum and float drum in he opposite direction.

2. An instrument for measuring and recording the tonnage on ships,comprising a rotatable scale drum, a reciprocable carrier adapted totraverse said scale drum, a float drum, a. float secured to said floatdrum by means of a cord thereby to rotate the drum in one direction,means for transmitting the rotary motion of said float drum to saidscale drum and to said carrier, means for retracting the carrier therebyto cause rotation of the scale drum and float drum in the oppositedirection, and means for varying the ratio or" motion between the floatand the scale drum.

3. An instrument for measuring and recording the tonnage on ships,comprising a rotatable scale drum, a reciprocable carrier adapted totraverse said scale drum, a float drum, a float secured to said floatdrum by means of a cord thereby to rotate the drum in one direction,means for transmitting the rotary motion of said float drum to saidscale drum and to said carrier, means for retracting the carrier therebyto cause rotation or" the scale drum and float drum in the oppositedirection, and means for varying the ratio of motion between the floatand the scale drum, said means comprising an axially movable cone sleevebetween the float drum and float and around which the float cord iswound.

4. An instrument for measuring and re cor-ding the tonnage on ships,comprising a rotatable scale drum, a reciprocable carrier adapted totraverse said scale drum, a float drum, a float secured to said floatdrum by means of a cord thereby to rotate the drum in one direction,means for transmitting the rotary motion of said float drum to saidscale drum and to said carrier, means for re tracting the carrierthereby to cause: rotation of the scale drum and float drum in theopposite direction, and a take-up drum between said float and floatdrum.

An instrument for: measuring and recording the term-age on ships,comprising a rotatable scale drum, a reciprocable carrier adapted totraverse said scale drum, a float drum, a float secured to said floatdrum by means of a cord thereby to cause rotation of said float drummeans for transmitting the,

rotary motion of said float drum to said so; le drum and to saidcarrier, and means for causing axial movement of said float drum duringthe rotation thereof.

6. The combination with an instrument for measuring and recording thetonnage on ships, of means for indicating displacement, means forindicating the list of the ship, and a suspension shaft from which allof said means are suspended.

In testimony whereof I have signed my name to this specification.

SOPHUS PETER BAHNSEN'.

